Gastroesophageal reflux disease
Also known as acid reflux, GERD occurs when stomach contents move back into the throat. This may cause a sour taste in the mouth and a burning sensation in the chest or throat, known as heartburn. Factors that may trigger acid reflux include obesity, smoking, pregnancy, and spicy or fatty foods. Heart pain and heartburn from acid reflux feel similar partly because the heart and esophagus are located close to each other and share a nerve network.